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Lifshitz Transition and Non-Fermi Liquid Behavior in Highly Doped Semimetals
- Title
- Lifshitz Transition and Non-Fermi Liquid Behavior in Highly Doped Semimetals
- Authors
- Kang, Kyungrok; Kim, Won June; Kim, Dohyun; Kim, Sera; Ji, Byungdo; Keum, Dong Hoon; Cho, Suyeon; Kim, Young-Min; Lebegue, Sebastien; Yang, Heejun
- Ewha Authors
- 조수연
- SCOPUS Author ID
- 조수연
- Issue Date
- 2021
- Journal Title
- ADVANCED MATERIALS
- ISSN
- 0935-9648
1521-4095
- Citation
- ADVANCED MATERIALS vol. 33, no. 1
- Keywords
- layered semimetals; Lifshitz transition; non‐ Fermi liquids; temperature‐ induced chemical potential shifts
- Publisher
- WILEY-V C H VERLAG GMBH
- Indexed
- SCIE; SCOPUS
- Document Type
- Article
- Abstract
- The classical Fermi liquid theory and Drude model have provided fundamental ways to understand the resistivity of most metals. The violation of the classical theory, known as non-Fermi liquid (NFL) transport, appears in certain metals, including topological semimetals, but quantitative understanding of the NFL behavior has not yet been established. In particular, the determination of the non-quadratic temperature exponent in the resistivity, a sign of NFL behavior, remains a puzzling issue. Here, a physical model to quantitatively explain the Lifshitz transition and NFL behavior in highly doped (a carrier density of approximate to 10(22) cm(-3)) monoclinic Nb2Se3 is reported. Hall and magnetoresistance measurements, the two-band Drude model, and first-principles calculations demonstrate an apparent chemical potential shift by temperature in monoclinic Nb2Se3, which induces a Lifshitz transition and NFL behavior in the material. Accordingly, the non-quadratic temperature exponent in the resistivity can be quantitatively determined by the chemical potential shift under the framework of Fermi liquid theory. This model provides a new experimental insight for nontrivial transport with NFL behavior or sign inversion of Seebeck coefficients in emerging materials.
- DOI
- 10.1002/adma.202005742
- Appears in Collections:
- 공과대학 > 화공신소재공학과 > Journal papers
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